Rock-drill seating and controlling means



H. STAGE. ROCK DRILL SEATING AND CONTROLLING MEANS.

APPLICATION FILED AUG. I5, IQISI Eaiented Apr 13, 1920*.

4 SHEETS-SHEET 1.

wi I HGOO H. I. STAGE. ROCK DRILL SEATING AND CONTROLLING MEANS.

- APPLICATION FILED AUG. I5. I9I8- 1,336,930. I

4 SHEETSSHEET 2.

Patented Apr. 13, 1-920.

H. I. STAGE. ROCK DRILL SEATING AND CONTROLLING MEANS.

APPLICATION FILED AUG. I5. I9I8 Patented Apr. 13, 1920,

4 SHEETS-SHEET 3.

Elmo/"5oz ZcZ K15221590 flare) 4 f H. 1. STAGE. ROCK DRILL SEATING AND CONTROLLING MEANS.

APPLICATION FILED AUG. 15, I918. 1,636,930. Patented Apr. 13, 1920.

. 4 SHEETS El-Maw HAROLD 1. STAGE, 013 DENVEBJ, COLORADO.

'ROCK-DB/ILL SEATING All D CONTROLLING MEANS.

Specification of Letters Patent.

Patenteta e. 13 1920.

Application filed August 15, 1913. Serial No. 250,038.

the drill feeding mechanism.

A further object is to provide an improved machine in which air pressure is employed to effect absolute seating of the drill in the bottom of the hole to eliminate reciprocation of the drill and prevent cutting or breaking away of the corners of the 'drill.

Another object resides in a live air cushion for the drill in the feeding thereof, so as to effect an automatic feed simulating the firm but yieldable pressure of the manual feed.

Further, the invention resides in the features of construction and the arrangements and combinations of parts described in detail in the following specification and defined in a succinct manner in the appended claims, reference being had to the accompanying drawings wherein' Figure 1 is a side elevation of the improved drill machine constituting the subject matter of the present invention;

Fig. 2 is a top plan view thereof;

Fig. 3 is a fragmentary longitudinal section through the drill-carrying end of the working or hammer cylinder Fig. A is a transverse section on of Fig. 3; n

Fig. is a longitudinal section through the feeding mechanism;

Fig. 6 is a fragmentary horizontal section on line 6-6 of Fig. 5;

Fig. 7 is a transverse section on line 7-7 of Fig. 6;

Figs. 8 and 9 line 4-4 are similar sections on lines 8 8 and 9 9 of Fi 5;

Fig. 10 a sectional view similar to Fig. 5) showing a dii'erent position of the valve; and v I Fig. 11 is a vertical longitudinal section through the forward head of the feed cylinder. I 4

Referring more in detail to the drawings, the numeral 1 designates the power cylinder in which ilS arranged the impact motor hammer 2 for operating on the drill bit 3. At the front head of the machine, a sleeve at is chambered to receive the hammer and has a reduced forward socket in which the bit is retained. A spacing ring 5 abuts the inner end of the sleeve and seats inthe inner end of a multichamber cylindrical member 6, which conformahly receives the sleeve e and has an internal shoal der 7 against which the latter seats. Surrounding the cylindrical member 6 is the front head or cap 8 having its front wall perforated to receive the collar 9 that is fixedly carried by the bit The rear end of the cap 8 has outstanding perforatedears 10 alined with like ears 11, extending fron the valve 6, for receiving the tie rods 12.

The forward end of the cylindrical member 6 is formed with an annular series of piston cylinders 13 that extend longitudinally of the member and communicate at is screwed into the head over a port 1?. One

of the cylinders 13, preferably the one diametrically opposite port 17., is formed with a second port 18, which communicates through a second head port 19 with the pipe 20, which delivers the fluid to the drill feed-- ing mechanism. in each cylinder a piston 21 is slidably mounted one of which opens and closes the port 18 and thus controls the flow of the live fluid. A drill seating control ring 22 connects the outer ends of the pistons and between this ring and the front wall of head 8 is disposed a floating ring 23 for engagement with the'collar 9 of the bit.

From any suitable soni'ce, fluid pressure is conducted by pipe 2% to the valve head 25, which controls the admission of fluid to the power cylinder 1 f0 reciprocating the hammer 2, a valve 26 being interposed in the pipe for shutting off the supply to the val ve head, if it so desired. liranchingdrom pipe 24- is the pipe 15. for conducting iive air to the drill holding means which, by reason of the cushioning effect of the compressed air, causes absolute seating of the drill on the bottom of the hole, thereby eliminating reciprocation of the drill and preventing cutting or breaking away of the corners thereof.

The drill feed mechanism comprises a cylinder 27 which has its rear end closed by a head 28 and its forward 'end closed by a head 29. The head 29 has a supporting disk 30 by which the machine is mounted on a suitable support, not shown. The head 29 receives a clamping ring 31 which clamps a packing ring therein to provide a stuffing box construction for the tubular piston rod casing '33. This casing carries on its outer or forward end a sleeve 34 having a bracket extension 35that embraces the cylinder of the impact motor, being securely connected thereto by the bolts 36. y

The heads of cylinder 27 are connected by tie rods or bolts 37 and upon these bolts is slidable a bracket support 38 having a forwardly extending arm terminating in an upstanding plate 39. This plate is perforated to receive the tie rods 12 that project through the adjacent head 40 of cylinder 1. Between the nuts 41, on the rods 12, and the plate 39 are coiled springs 42 normally holding the latter against the cylinder head and designed to ease the operation and rebound of the machine.

The piston 43, which is operable in cylinder 27, has a tubular piston rod 44 arranged concentrically in the casing 33 and formed at its forward end into a valve casing 45 that is seated in the sleeve 34, as illustrated in Fig. 5. The protruding end of this valve casing is threaded for receiving a cap nut 46. The inner end of the piston rod casing is enlarged and shaped to securely clamp and "hold the piston packing 47 between it and the piston 43.

A rack or toothed member 48 is disposed within the hollow piston rod, being supported therefrom at its forward end by a spider 49, secured to said member, and receiving support at its rear end from a feeding device 50 which is connected thereto.- This device has its stem slidably carried by the cylinder head 28, being resiliently urged forward by the coiled spring 51. The rack tube 48 is provided on its outer opposite sides with a series of teeth or notches 52, those on one side being preferably staggered relative to those on the opposite side thereof.

A pair of pawls are pivotally carried by the piston 43 for engaging the teeth 52 so that as the piston and its connected drill are advanced the pawls by engaging with the teeth WillPl'QVGIlt retrograde movement.

'A U-shaned sa'rin 54 secured between its ends to the'pist'on 43, has its terminals bearing on the pawls to urge them to operative position;

A valve is rotatably seated in the valve casing 45 and carries a key: rod 56 which extends through the piston rod andthe spider 49 into the tubular rack member. This key rod 15 square in cross section and while it is relatively movable in an axial upon a rock barrier.

manner to the spider the latter may readily be rotated upon turning the rod. Consequently, the teeth may be turned out of engagement with the pawl to permit the piston being retracted.

Fluid pressure is admitted from pipe 20 through the thimble connection 57 (Figs. 9 and 10) and into the valve casing 45, the latter being formed with connecting passageways or by-passcs 58 for connecting the ports of the valve and also enibodying a duct :35) leading to the space between the pistonv rod and its casing. The valve is provided with an inlet port 60 communieating with the duct 59 and an inlet port 61 establishing communication with the space within the piston rod. Both 'inlet ports also serve as exhaust ports when con-' nected by the passageways 58 with the radial exhaust ports 62 and 63 which merge into a common port G4'leading axially through the valvestem and handle .55. A coiled spring 66 encircles the valve stem and urges a tight seating of the valve, at the same time allowing rotation thereof.

In operation, assuming that the drill has just been set and started in its operation The impact motor hammer 2 will drive the drill forwardly, sliding it in its supporting sleeve until the collar 9 has been carried outwardly a fixed distance at which time the piston 21 will have uncovered port 18, the drill seating control ring following the said collar by the live air pressure acting against the pistons 21.

As soon as port 18 is uncovered, live air pressure is admitted into cylinder 27 until the port 18 is again closed by the piston 21. This closing of the port 18 results from the advancing of the drilling machine while the drill itself has been held comparatively still by seating or engaging on the bottom of the hole being drilled. The machine is in a constant state of reciprocation caused by impact of the hammer against the drill and the compressed and will upon expansion, and with the aid of the air pressure, back of piston 43, feed the latter forward upon full stroking of the hammer. The air pressure back of the piston acts as a balance for the impact motor and all of the parts carried by the latter. 7 Thus as the motormoved forward more live air is admitted back of the piston 4t, and the latter thus is at all timesbalanced by air pressure.

Consequently, the drill is intermittently fed and at the same time'is held against its work by the control ring which is constantly held in abutting relation with the collar 9 b5.- the fluid pressure. Thus in addition to theautomatic advance of the machine, the

control ring holds'the drill firmly against -the. botton1 of the hole at all times while I returning the mechanism.

- ranged sleeve supporting the latter,

ceased and it is desired to return the machine to normal position for another start, the valve is adjusted" to permit the ingress of fluid pressure in advance of the piston 43 to reverse the travel thereof, the rack-or toothed member 48 being simultaneously rotated from engagement by the'pawls 53 so that the return of the machine tostarting position is easily and expeditiously performed.

The piston rod casing is provided in its inner end with the ports 67, whereby the air pressure, that is admitted tothe space between the piston rod and its casing, may find a Way of escape into the cylinder 27 in advance of the piston to act thereon in The fluid pressure While holding the drill constantly on the work, performs this function in a manner similar to the manual feed which heretofore has been the only practical feed as the hand pressure permits suflicient yieldability and flexibility to prevent chipping or cutting same time eliminating the rebound of the drill.

' What is claimed is:

1. In a drill feeding machine, a cylinder,

an impact motor hammer therein, a drill, a

a head for the cylinder, through which the drill extends, a ring encircling the drill and arranged "within the head for limited movement to hold the drill against its work, matic means for operating the ring. I

2. In a drill feeding machine, a cylinder, an impact motor hammer therein, a drill, a sleeve supporting the latter, a head for the cylinder through. which the drill extends, a ring encircling the drill and arwithinthe head for limited movement to hold the drill against its work, a cylinder within the head, a piston operable therein to move the ring to operative position, and means for sliding the piston in the second cylinder.

8. In a drill feeding machine, a cylinder, an impact motor hammer therein, a drill, a sleeve supporting the latter. a head for the cylinder through which the drill e);- tends, a ring encircling the drill and arranged within the head for limited movement to hold the drill against its work, a collar fixed on the drill against which the ring abuts, and fluid pressure means yieldably urging the ring forwardly.

4. In a drill feeding machine. a cylinder, an impact motor hammer therein, a drill, a sleeve supporting the latter, a head for of the drill and at the,

cylinder through which and pneuthe cylinder through which the drill extends, a ring encircling the drill and arranged within the head for limited movement to hold the drill against its work, a plurality of chambers, means for supplying air pressure thereto, and pistons operable in the plural chambers for moving the ring forwardly.

5. 1n a drill feeding machine, a cylinder, an impact motor hammer therein, a drill, a sleeve supporting the latter, a head for the cylinder through which the drill extends, a ring encircling the drill and arranged within the head ior limited movement to hold the drill against its work, a

,multi-chambered member arranged within the head about the sleeve, the chambers of saidmember opening forwardly,- and pistons in the chambers of said member connected to the ring. 7

(5. In a drill feeding machine, a cylinder. an impact motor hammer therein, a drill, a sleeve supporting the latter, a head for the cylinder through which the drill ex tends, a ring'encircling the drill and arranged within the head for limited move ment to hold the drill. against its work, a multi-chambered membe' arranged within the head about the sleeve, the chambers of said member opening forwardly and having radial ports leading from their rear ends. said member also having a peripheral groove connecting the ports, and pistons operable in the chambers of said member to move the ring forwardly.

T. In a drill feeding machine, a cylinder, an impact motor hammer therein, a drill, a sleeve supporting the latter. a head for the the drill extends. a ring encircling the drill and arranged within the head for limited movement to hold the drill against its work, a multi-chambercd member arranged within the head about the sleeve, the chambers of said member opening forwardly and having radial ports leading from their rear ends, said member also having a peripheral groove connecting the ports, pistons operable in the chambers oi said member to move the ring forwardly, and a fluid pressure inlet in the head communicating with the groove of the member.

8. In a drill feeding machine, a cylinder, an impact motor hammer thereima drill, a sleeve supporting the latter, a head for the cylinder through which the drill extends, a ring encircling the drill and arranged within the head for limited movement to hold the drill against its work, a multi-chambered member arranged within the head about the sleeve, the chambers of said member open-' said member also impact motor carrying the same, and a feed mechanism for the drill comprising a cylinder, a hollow piston head reciprocal in the cylinder and having a hollow piston rod terminating in a valve casing. a valve in the latter for ccmtrolling the admission of fluid pressure through the piston rod into the cylinder, means connecting the motor to the piston rod for simultaneous movement, and a casing sin'rounding the piston rod and communicating atits inner end with the cylinder in advance of the piston head, said valve casing having a port controlled by said valve and leading to the space between the piston ,rod-and its inclosing casing, said piston rod-casing having a port establish ing comm mication betw en said space and the interior of the cylinder in advance of the hollow piston head.

10. In a drill feeding machine. a drill, an impact motor carrying the same, and a feed mechanism for the drill comprising a cylinder, a hollow piston head reciprocal in the cylinder and having a hollow piston rod terminating in a valve casing, a valve in the latter for controlling the admission of fluid pressure through the piston rod into the cylinder, means for locking the piston step by step, and means operable by the valve for rendering the locking means 1noperative.

ll. Ina drill feeding machine, a drill,

an impact motor carrying the same, and. a feed mechanism for the drill comprising a cylinder, a hollow piston head reciprocal in the cylinder and having a hollow piston rod terminating in a valve casing, a valve in the latter for controlling the admission of fluid. pressure through the piston rod into the cylinder, a toothed member in the cylinder,

a pawl carried by the piston and engaging the toothed member to hold the piston head against returning, and means connecting the piston rod to the motor.

12. In a drill feeding machine, a drill, an impact motor carrying the same. and a feed mechanism for the drill comprising a cylinder, a hollow piston head reciprocal in the cylinder and having a hollow piston rod terminating in a valve casing, a valvein the latter for controlling the admission of fluid pressure through the piston rod into the cylinder, means supporting the motor from the piston rod, a rotatable toothed member telescopically related to the piston head and disposed in the cylinder, a pawl carried by the piston head for engaging the teeth of the toothed member, and means for rotatfeeding fluid pressure to the teeding mechanism and ing the tooth member to bring its teeth from engagement by the pawl to permit return movement of the piston head.

13. In a drill feeding machine, a drill, an impact motor carrying the same, and a feed mechanism forthe drill comprising a cylinder, a hollow piston head reciprocal in the cylinder and having a hollow piston rod terminating in avalve casing, a valve in the latter for controlling the admission of fluid pressure through the piston rod into the cylinder, means for supporting the motor from the piston rod, a rotatable toothed member telescopically related to the piston head and disposed in the cylinder, a pawl carried by the piston head for engaging the teeth of the toothed membe', and a key rod operable by the valve and slidably connected to the toothed member to rotate the latter and thereby disengage its teeth from the pawl.

1%. In a drill feeding machine, a drill, an impact motor carrying the same, and a feed mechanismfor the drill com nisin a cylinder, a hollow piston head reciprocal in the cylinder and having a hollow terminating in a valve casing, a valve in the latter for controlling the admissionof fluid pressure through the piston rod into the cylinder. means supporting the motor from the piston rod, a rotatable toothed member telescopically related to the piston head and disposed in the cylinder, a pawl carried by the piston head for engaging the teeth of the toothed member, a key rod operable by the valve and slidably connected to thetoothed member to rotate the latter and thereby disengage its teeth from the pawl, and a device secured, to the inner end ofthe toothed member and yieldably and slidably connected to the adjacent head or the cylinder.

15. In a drill feeding machine a drill, an impact motor carrying the same, and a feed mechanisn'i for the drill comprising a cylinder, a piston head operable in the cylinder having an outwardly extending piston rod on its inner end, a bracket member connecting the outer end of the piston rod to the piston rod 16. In a drill feeding machine, an impact motor including a sleeve.a nnilti-chambered member inclosing the latter the chambers of said member opening forwardly and communicating one with another, a piston in each chamber, a drill seating control member operable by the said pistons, a drill feeding mechanism including a feeding piston. means supporting the motor from the said piston, and means for admitting controlled by one of theiir'st-pistons. I

scsecc 17. in a drill feeding machine, a cylinder, an impact motor hammer therein, a drill, a sleeve supporting the latter, a head for the cylinder through which the drill extends, a ring encircling the drill and arranged within the head for limited movement to hold the drill against its Work, a multichamhered member arranged Within the head about the the sleeve, the chambers of said member opening forwardly and having radial ports leading from their rear ends, said member also having a peripheral groove connecting the ports, pistons operable in the chambers of said member to more the ring: forwardly, a. fluid pressure inlet in the head communicating with the groove of the member, one chamber of the latter having an outlet port which is opened and closed by the contained piston, and a fluid-operated drill feding mechenism connected to the outer pot of said member.

18. ln a drill feeding machine, a cylinder, an impact 1 ,otor hammer therein, a drill, a sleeve supporting the latter, a head for the cylinder through WlllClll-llG drill extends, a ring encircling the drill and arranged within the head for limited movement to hold the drill against its work, a multi-chambered member arranged Within the head about the sleeve, the chambers of said member opening forwardly and l aving radial ports leading from their rear ends, said member, also having a peripheral groove connecting the ports, pistons operable in the chambers of said member to move the ring forwardly, a fluid pressure inlet in the head communicating with the groove of the member,- one chamber of the latter having an outlet port which is ope ed and closed by the contained piston, a fluid-operated drill feeding mechanism including a. cylinder and piston, means connecting the latter to the first named cylinder, and means for admitting fluid pressure from the outlet port of said member to mechanism cylinder.

l9. In a drill feeding machine, a cylinder, an impact motor hummer therein, a drill, a sleeve supporting' the latter, a. head for the cylinder through vvhich the drill extends, av ring encircling; the drill and arranged "Williin the head for limited uimcment to hold the drill against its work, a cylinder Within head having a iluid pressure inlet and out I means operable in the second cylinder move the ring to operative position and for opening and closing the outlet, and a feed mechanism for the drill comprising' a cylinder,-and a l'luid cushioned piston reciprocal in the latter and connected to the first cylinder, said feed mechanism being connected to the said outlet port.

20. In a drill feeding;- machine, a cylinder, an impact motor hammer therein, a drill, a. sleeve supporting the latter, a head for the cylinder through which the drill extends, a rin; encircliny the drill. and arranged within the head ror limited movement to hold the drill against its work, a cylinder Within the head havinga fluid pressure inlet and outlet. means operable in the second cylinder to move the ring to operative position and for opening and closing the outlet, and a feed mechanism for the drill comprising a cylinder, a hollow piston head reciprocal in the cylinder and having a hollow piston rod terminating in a 'alve casing, a velve in the latter for controlling the admission of fluid pressure through the piston rod into the cylinder, means supporting too first cylinder from the hollow piston rod, and means conthe let ncctinp; the outlet of the second cylinder the valve.

in testimony whercoi I have hereunto set my hand in the presence oi. tivo subscribing Witnesses.

L All. 

